Work-holder.



L. TUNICH.

WORK HOLDER.

APPLICATION FILED MAR. 2. 1915.

l 9?9 v Patented July 27, 1915.

2 SHEETS-SHEET l.

[mur

L.YTUN|CH. WORK HOLDER.

APPLICATION FILED MAR. 27, 1,915.

Patented July 27, 1915 2 SHEETS-SH EET 2.

NN @A N speaacaam raient. Patenten July 27, was.,

Application led March 27, 1915. Serial No. 17,331.

l State of Michigan, have invented certain new and useful Improvements in Work- Holders, of which the following is a specifi.- cation, reference being had therein to the accompanying drawings.

This invention relates. to.a .work holder, andthe primary object of my invention is to provide a novel rotary holder wherein positive and reliable means are employed, in a manner as hereinafter` set forth, for holding pieces vof work while thesame are subjected to the action of a grinding machine or otherwise treated or finished, the work holder eventually ejecting a piece of the work and obviating the necessity of manual manipulation before a machine.

Another object of this invention is to provide a novel machine for continuously feedingpieces of work to a grinding macl1iiie,"\'vhereby the pieces of work can be ground with uniformity and precluding any possibility of inaccurac or injury as compared `to hand manipu ation of a piece of work against a grinding wheel, or surface.

A further object of this invention is to provide a work holder that can be advantageously' used as a part of a grinding machine for grinding or finishing valves adapted to form part of internal combustion engines; it having been heretofore the practice for a workman to manually manipulate such valves against the surface of the vgrinding wheel to finish the saine and such practice requires constant attention on the part of the workman and then with no assurance of uniformity or perfection, besides at all times being liable to personal injury by the hands contacting with the grinding device.

The above and other objects are attained by a work holder wherein the parts are con' structed with a view of reducing the costof manufactunand at the same time retain the features by which safety, durability, siniplicity and'ease of fabrication are secured, and with such ends in view, the invention resides in the novel construction, combination and arrangement of parts to be hereinafter specifically described and then claimed.

Reference will now be had to the drawings, wherein- 14 .for a longitudinal drive shaft 15 Figure .1 is a side elevation of a work holder; Fig. 2 is a plan of the same; Fig. 3 1s a front elevation of the work holder partly broken away; Fig. 4 is a rear elevation of the same partly broken away and partly 1n section, and Fig. 5 is an enlarged detail sectional view taken on the line V-V o f Fig. 3; Fig. 6, is lan enlarged detail sectional view taken on the line VI-Vl of Fig. 3 and Fig. 7 is an enlarged detail section'al view taken on the line VIL-VH of Fig. 3. i -In describing my invention by ai of the views above referred to, I desire to point out 'that the same are merely illustrative of i an eiiample whereby my invention may be applied in practice, and I do not care to confine my invention to the precise construction and arrangement of parts shown. I The following description is therefore to be broadly construed as including substitute constructions and arrangement of parts which are the obvious equivalents of those to be hereinafter referred to.

1n the drawings, the reference numeral 1v denotes a hollow base having the top thereof provided with a longitudinal dove-tailed groove or guideway 2 for the'depen/ding 1ongitudinal dove-tailed tongue 3' of a carriage 4 shdable upon the top of the base. The

tongue 3 has a depending nut 5 in threaded' engagement with a feed screw 6 journaled in the upper part of the base 1. The feed screw 6 has a beveled gear wheel 7 meshing with a small beveled gear wheel 8 on the inner end of a shaft 9, journaledin the side wall of the base. The outer end of the shaft `9 has a suitable handle or crank 10 and the elements 5 to 10 inclusive constitute adjustable means for moving the carriage 4 and correctly positioning the same relative to a ygrinding machine. To hold the caru riage 4 in adjusted position, said carriage is provided with a locking device comprising a screw 11, a clamping block 12 and a handle or crank 13, these elements being as best shown in Fig. 4.

The carriage l is provided with bearings rovided with a pulley 16, between the bearihgs 1i whereby the shaft 15 can be driven from a suitable source of power, as a motor. The shaft 15 protrudes from one of the bearin s 14C and is provided with a circular head 1 i j operating with the head 17 in forming a pelmounted in said openings are wor ripheral channel 19. The flange 18 has a plurality lof equally spaced circumferentially arranged openings 20 alining with openings 21 in the `head 17 and yieldably holders 22. The work holders 22 have longitudinal bores 2,3 and heads 24, said bores accommodating the stems 25 of pieces of work 26, which have beenshown as' in the `form of valves. The work4 holders are eXteriorly screwthreaded for a portion of their length to receive nuts 27 and encircling said `holders, are coiled compression springs 28. These springs yieldably hold the work holders inthe openings 20 and 21 and maintain said 'work holders normally in an extended position.

The bearing 14, contiguousto the head 17 has a bracket 29 supporting a segment hood 30 .which has the outer wall 31 thereof in front of a portion of the head 17, as best shown in Figs. 3 and 7. An end of the wall 31 is flared, as at'32, whereby the valves 26 can be easily carried 4into engagement with lthe inner side-.oitl the wall 31, said wall serving functionally` as a-cam which forces the work holders'- 22 inwardly, placing the rsprings 28'nnder additional tension. These springs however maintainthe valves 26 against the wall 31 until the valves `are carried into engagement withl the face of a.

grinding wheel or the grinding element of a suitable machine, and to vindicate the position of such machine, the dot and dash line designated 33 in Fig. 3,-indicates a wheel of sufficient diameter to permit of aplurality of' pieces 4 of work being simultaneously ground. p

`By adjusting the nuts 27 the pressure of the pieces of work' against the wall 31 and the grinding wheel canbe regulated and to vengagement with the grinding wheel. After the pieces of work have wiped the wall 36, the ieces of work are ejected from the work hol ers by reason of the springs 28 imparting sufficient impetus to the work holders to eject the pieces of work.

To prevent a rearward or counterclockwise movement of the head 17, the rear side of the head is provided with ratchet teeth 35* and engaging said teeth is a spring pressed pawl 36, carried by an extension '37 of the bearing 14 adjacent the'head 17.

In operation, it is only necessary for an attendant of` the machine to place the valves or 'pieces of work in the-work holders as the head 17 is slowly revolved, and with the attendant of the machine located upon that side thereof opposite the grinding machine there is no danger of the hand contacting with the inding machine o r the attendant injured. he pieces of workA are automatically ground and ejected from the work holders Aand in consequence .of a machine of this type alarge amount of work can he expedltlously produced.

1. A machine of the type described, comprising a rotary'head, a plurality of yieldable work holders carried thereby, means in front of said head adapted to maintain the work holders in a retracted position vpreparatory to certain operations, andmeans 1n front of said head and opposite the first mentionedy means adapted to retain said work holders in a Aretracted position until such operations are completely finished.

2. In a work holder, the combination with a grinding wheel, of a carriage adjustable relative to said wheel, a rotary head supported by. said carriage in front of a portion of said'wheel, a plurality of yieldable work holders carried by said head, means carried by Asaid carria e 1n a plane with-said grinding wheel an adapted to retain pieces'of work n said holders and said holders in a retracted position preparatory to engaging said grinding wheel, and means carried by said carriage in a plane with said grinding wheel adapted to holdsaid work holders in a retracted position preparatory. to ejecting work held thereby.

3. In a work holder, the combination .'ith a grinding wheel, of acarriage adjustable said carriage in front of a portion of said grinding wheel, a plurality of work holdersV onvsaid head, means 4on said carriage in front of a portion of said rotary head and in the plane of said grinding wheel adapted to be engagedby pieces of work in` said work holdersV to retract said work holders preparatory to placing work in engagement with said grinding wheel, and means on said carriage in front of another portion of said rotary head and in the plane ofsaid grinding wheel adapted to retain said work holders in a retracted position until the grinding o eration has been completely finished.

4. n a work holder, the combination with relative thereto, a rotary head supported by said carriage, a plurality. of yieldable work holders supported by said head, means adj acent said head adapted to retract said work holders preparatory to grinding operations i mezeeo of said machine, and means on said carriage paratory to placing pieces of work carried 10 engaging said head adapted to prevent a thereby in engagement with said grinding counter clockwise movement thereof.- wheel.

5. The combination with a grinding wheel, 1n testimony whereof I aix my signature of a head movable relative thereto, a pluin presence of'two witnesses.

rality of work holders yieldably supported LAZA4 TUNCH. by said head, and means in front of said Witnesses:

head and in the plane of said grinding wheel ANNA M. Dona,

adapted to retract said wor holders pre- H. BUTLER. 

